menu "x86 architecture" depends on X86 config SYS_ARCH default "x86" choice prompt "Run U-Boot in 32/64-bit mode" default X86_RUN_32BIT help U-Boot can be built as a 32-bit binary which runs in 32-bit mode even on 64-bit machines. In this case SPL is not used, and U-Boot runs directly from the reset vector (via 16-bit start-up). Alternatively it can be run as a 64-bit binary, thus requiring a 64-bit machine. In this case SPL runs in 32-bit mode (via 16-bit start-up) then jumps to U-Boot in 64-bit mode. For now, 32-bit mode is recommended, as 64-bit is still experimental and is missing a lot of features. config X86_RUN_32BIT bool "32-bit" help Build U-Boot as a 32-bit binary with no SPL. This is the currently supported normal setup. U-Boot will stay in 32-bit mode even on 64-bit machines. When booting a 64-bit kernel, U-Boot will switch to 64-bit just before starting the kernel. Only the bottom 4GB of memory can be accessed through normal means, although arch_phys_memset() can be used for basic access to other memory. config X86_RUN_64BIT bool "64-bit" select X86_64 select SPL select SPL_SEPARATE_BSS help Build U-Boot as a 64-bit binary with a 32-bit SPL. This is experimental and many features are missing. U-Boot SPL starts up, runs through the 16-bit and 32-bit init, then switches to 64-bit mode and jumps to U-Boot proper. endchoice config X86_64 bool config SPL_X86_64 bool depends on SPL choice prompt "Mainboard vendor" default VENDOR_EMULATION config VENDOR_ADVANTECH bool "advantech" config VENDOR_CONGATEC bool "congatec" config VENDOR_COREBOOT bool "coreboot" config VENDOR_DFI bool "dfi" config VENDOR_EFI bool "efi" config VENDOR_EMULATION bool "emulation" config VENDOR_GOOGLE bool "Google" config VENDOR_INTEL bool "Intel" endchoice # subarchitectures-specific options below config INTEL_MID bool "Intel MID platform support" select REGMAP select SYSCON help Select to build a U-Boot capable of supporting Intel MID (Mobile Internet Device) platform systems which do not have the PCI legacy interfaces. If you are building for a PC class system say N here. Intel MID platforms are based on an Intel processor and chipset which consume less power than most of the x86 derivatives. # board-specific options below source "board/advantech/Kconfig" source "board/congatec/Kconfig" source "board/coreboot/Kconfig" source "board/dfi/Kconfig" source "board/efi/Kconfig" source "board/emulation/Kconfig" source "board/google/Kconfig" source "board/intel/Kconfig" # platform-specific options below source "arch/x86/cpu/apollolake/Kconfig" source "arch/x86/cpu/baytrail/Kconfig" source "arch/x86/cpu/braswell/Kconfig" source "arch/x86/cpu/broadwell/Kconfig" source "arch/x86/cpu/coreboot/Kconfig" source "arch/x86/cpu/ivybridge/Kconfig" source "arch/x86/cpu/efi/Kconfig" source "arch/x86/cpu/qemu/Kconfig" source "arch/x86/cpu/quark/Kconfig" source "arch/x86/cpu/queensbay/Kconfig" source "arch/x86/cpu/slimbootloader/Kconfig" source "arch/x86/cpu/tangier/Kconfig" # architecture-specific options below config AHCI default y config SYS_MALLOC_F_LEN default 0x800 config RAMBASE hex default 0x100000 config XIP_ROM_SIZE hex depends on X86_RESET_VECTOR default ROM_SIZE config CPU_ADDR_BITS int default 36 config HPET_ADDRESS hex default 0xfed00000 if !HPET_ADDRESS_OVERRIDE config SMM_TSEG bool default n config SMM_TSEG_SIZE hex config X86_RESET_VECTOR bool default n select BINMAN # The following options control where the 16-bit and 32-bit init lies # If SPL is enabled then it normally holds this init code, and U-Boot proper # is normally a 64-bit build. # # The 16-bit init refers to the reset vector and the small amount of code to # get the processor into 32-bit mode. It may be in SPL or in U-Boot proper, # or missing altogether if U-Boot is started from EFI or coreboot. # # The 32-bit init refers to processor init, running binary blobs including # FSP, setting up interrupts and anything else that needs to be done in # 32-bit code. It is normally in the same place as 16-bit init if that is # enabled (i.e. they are both in SPL, or both in U-Boot proper). config X86_16BIT_INIT bool depends on X86_RESET_VECTOR default y if X86_RESET_VECTOR && !SPL help This is enabled when 16-bit init is in U-Boot proper config SPL_X86_16BIT_INIT bool depends on X86_RESET_VECTOR default y if X86_RESET_VECTOR && SPL && !TPL help This is enabled when 16-bit init is in SPL config TPL_X86_16BIT_INIT bool depends on X86_RESET_VECTOR default y if X86_RESET_VECTOR && TPL help This is enabled when 16-bit init is in TPL config X86_32BIT_INIT bool depends on X86_RESET_VECTOR default y if X86_RESET_VECTOR && !SPL help This is enabled when 32-bit init is in U-Boot proper config SPL_X86_32BIT_INIT bool depends on X86_RESET_VECTOR default y if X86_RESET_VECTOR && SPL help This is enabled when 32-bit init is in SPL config RESET_SEG_START hex depends on X86_RESET_VECTOR default 0xffff0000 config RESET_VEC_LOC hex depends on X86_RESET_VECTOR default 0xfffffff0 config SYS_X86_START16 hex depends on X86_RESET_VECTOR default 0xfffff800 config HAVE_X86_FIT bool help Enable inclusion of an Intel Firmware Interface Table (FIT) into the image. This table is supposed to point to microcode and the like. So far it is just a fixed table with the minimum set of headers, so that it is actually present. config X86_LOAD_FROM_32_BIT bool "Boot from a 32-bit program" help Define this to boot U-Boot from a 32-bit program which sets the GDT differently. This can be used to boot directly from any stage of coreboot, for example, bypassing the normal payload-loading feature. config BOARD_ROMSIZE_KB_512 bool config BOARD_ROMSIZE_KB_1024 bool config BOARD_ROMSIZE_KB_2048 bool config BOARD_ROMSIZE_KB_4096 bool config BOARD_ROMSIZE_KB_8192 bool config BOARD_ROMSIZE_KB_16384 bool choice prompt "ROM chip size" depends on X86_RESET_VECTOR default UBOOT_ROMSIZE_KB_512 if BOARD_ROMSIZE_KB_512 default UBOOT_ROMSIZE_KB_1024 if BOARD_ROMSIZE_KB_1024 default UBOOT_ROMSIZE_KB_2048 if BOARD_ROMSIZE_KB_2048 default UBOOT_ROMSIZE_KB_4096 if BOARD_ROMSIZE_KB_4096 default UBOOT_ROMSIZE_KB_8192 if BOARD_ROMSIZE_KB_8192 default UBOOT_ROMSIZE_KB_16384 if BOARD_ROMSIZE_KB_16384 help Select the size of the ROM chip you intend to flash U-Boot on. The build system will take care of creating a u-boot.rom file of the matching size. config UBOOT_ROMSIZE_KB_512 bool "512 KB" help Choose this option if you have a 512 KB ROM chip. config UBOOT_ROMSIZE_KB_1024 bool "1024 KB (1 MB)" help Choose this option if you have a 1024 KB (1 MB) ROM chip. config UBOOT_ROMSIZE_KB_2048 bool "2048 KB (2 MB)" help Choose this option if you have a 2048 KB (2 MB) ROM chip. config UBOOT_ROMSIZE_KB_4096 bool "4096 KB (4 MB)" help Choose this option if you have a 4096 KB (4 MB) ROM chip. config UBOOT_ROMSIZE_KB_8192 bool "8192 KB (8 MB)" help Choose this option if you have a 8192 KB (8 MB) ROM chip. config UBOOT_ROMSIZE_KB_16384 bool "16384 KB (16 MB)" help Choose this option if you have a 16384 KB (16 MB) ROM chip. endchoice # Map the config names to an integer (KB). config UBOOT_ROMSIZE_KB int default 512 if UBOOT_ROMSIZE_KB_512 default 1024 if UBOOT_ROMSIZE_KB_1024 default 2048 if UBOOT_ROMSIZE_KB_2048 default 4096 if UBOOT_ROMSIZE_KB_4096 default 8192 if UBOOT_ROMSIZE_KB_8192 default 16384 if UBOOT_ROMSIZE_KB_16384 # Map the config names to a hex value (bytes). config ROM_SIZE hex default 0x80000 if UBOOT_ROMSIZE_KB_512 default 0x100000 if UBOOT_ROMSIZE_KB_1024 default 0x200000 if UBOOT_ROMSIZE_KB_2048 default 0x400000 if UBOOT_ROMSIZE_KB_4096 default 0x800000 if UBOOT_ROMSIZE_KB_8192 default 0xc00000 if UBOOT_ROMSIZE_KB_12288 default 0x1000000 if UBOOT_ROMSIZE_KB_16384 config HAVE_INTEL_ME bool "Platform requires Intel Management Engine" help Newer higher-end devices have an Intel Management Engine (ME) which is a very large binary blob (typically 1.5MB) which is required for the platform to work. This enforces a particular SPI flash format. You will need to supply the me.bin file in your board directory. config X86_RAMTEST bool "Perform a simple RAM test after SDRAM initialisation" help If there is something wrong with SDRAM then the platform will often crash within U-Boot or the kernel. This option enables a very simple RAM test that quickly checks whether the SDRAM seems to work correctly. It is not exhaustive but can save time by detecting obvious failures. config FLASH_DESCRIPTOR_FILE string "Flash descriptor binary filename" depends on HAVE_INTEL_ME || FSP_VERSION2 default "descriptor.bin" help The filename of the file to use as flash descriptor in the board directory. config INTEL_ME_FILE string "Intel Management Engine binary filename" depends on HAVE_INTEL_ME default "me.bin" help The filename of the file to use as Intel Management Engine in the board directory. config USE_HOB bool "Use HOB (Hand-Off Block)" help Select this option to access HOB (Hand-Off Block) data structures and parse HOBs. This HOB infra structure can be reused with different solutions across different platforms. config HAVE_FSP bool "Add an Firmware Support Package binary" depends on !EFI select USE_HOB help Select this option to add an Firmware Support Package binary to the resulting U-Boot image. It is a binary blob which U-Boot uses to set up SDRAM and other chipset specific initialization. Note: Without this binary U-Boot will not be able to set up its SDRAM so will not boot. config USE_CAR bool "Use Cache-As-RAM (CAR) to get temporary RAM at start-up" default y if !HAVE_FSP help Select this option if your board uses CAR init code, typically in a car.S file, to get some initial memory for code execution. This is common with Intel CPUs which don't use FSP. choice prompt "FSP version" depends on HAVE_FSP default FSP_VERSION1 help Selects the FSP version to use. Intel has published several versions of the FSP External Architecture Specification and this allows selection of the version number used by a particular SoC. config FSP_VERSION1 bool "FSP version 1.x" help This covers versions 1.0 and 1.1a. See here for details: https://github.com/IntelFsp/fsp/wiki config FSP_VERSION2 bool "FSP version 2.x" help This covers versions 2.0 and 2.1. See here for details: https://github.com/IntelFsp/fsp/wiki endchoice config FSP_FILE string "Firmware Support Package binary filename" depends on FSP_VERSION1 default "fsp.bin" help The filename of the file to use as Firmware Support Package binary in the board directory. config FSP_ADDR hex "Firmware Support Package binary location" depends on FSP_VERSION1 default 0xfffc0000 help FSP is not Position Independent Code (PIC) and the whole FSP has to be rebased if it is placed at a location which is different from the perferred base address specified during the FSP build. Use Intel's Binary Configuration Tool (BCT) to do the rebase. The default base address of 0xfffc0000 indicates that the binary must be located at offset 0xc0000 from the beginning of a 1MB flash device. if FSP_VERSION2 config FSP_FILE_T string "Firmware Support Package binary filename (Temp RAM)" default "fsp_t.bin" help The filename of the file to use for the temporary-RAM init phase from the Firmware Support Package binary. Put this in the board directory. It is used to set up an initial area of RAM which can be used for the stack and other purposes, while bringing up the main system DRAM. config FSP_ADDR_T hex "Firmware Support Package binary location (Temp RAM)" default 0xffff8000 help FSP is not Position-Independent Code (PIC) and FSP components have to be rebased if placed at a location which is different from the perferred base address specified during the FSP build. Use Intel's Binary Configuration Tool (BCT) to do the rebase. config FSP_FILE_M string "Firmware Support Package binary filename (Memory Init)" default "fsp_m.bin" help The filename of the file to use for the RAM init phase from the Firmware Support Package binary. Put this in the board directory. It is used to set up the main system DRAM and runs in SPL, once temporary RAM (CAR) is working. config FSP_FILE_S string "Firmware Support Package binary filename (Silicon Init)" default "fsp_s.bin" help The filename of the file to use for the Silicon init phase from the Firmware Support Package binary. Put this in the board directory. It is used to set up the silicon to work correctly and must be executed after DRAM is running. config IFWI_INPUT_FILE string "Filename containing FIT (Firmware Interface Table) with IFWI" default "fitimage.bin" help The IFWI is obtained by running a tool on this file to extract the IFWI. Put this in the board directory. The IFWI contains U-Boot TPL, microcode and other internal items. endif config FSP_TEMP_RAM_ADDR hex depends on FSP_VERSION1 default 0x2000000 help Stack top address which is used in fsp_init() after DRAM is ready and CAR is disabled. config FSP_SYS_MALLOC_F_LEN hex depends on FSP_VERSION1 default 0x100000 help Additional size of malloc() pool before relocation. config FSP_USE_UPD bool depends on FSP_VERSION1 default y help Most FSPs use UPD data region for some FSP customization. But there are still some FSPs that might not even have UPD. For such FSPs, override this to n in their platform Kconfig files. config FSP_BROKEN_HOB bool depends on FSP_VERSION1 help Indicate some buggy FSPs that does not report memory used by FSP itself as reserved in the resource descriptor HOB. Select this to tell U-Boot to do some additional work to ensure U-Boot relocation do not overwrite the important boot service data which is used by FSP, otherwise the subsequent call to fsp_notify() will fail. config ENABLE_MRC_CACHE bool "Enable MRC cache" depends on !EFI && !SYS_COREBOOT help Enable this feature to cause MRC data to be cached in NV storage to be used for speeding up boot time on future reboots and/or power cycles. For platforms that use Intel FSP for the memory initialization, please check FSP output HOB via U-Boot command 'fsp hob' to see if there is FSP_NON_VOLATILE_STORAGE_HOB_GUID (asm/fsp1/fsp_hob.h). If such GUID does not exist, MRC cache is not available on such platform (eg: Intel Queensbay), which means selecting this option here does not make any difference. config HAVE_MRC bool "Add a System Agent binary" depends on !HAVE_FSP help Select this option to add a System Agent binary to the resulting U-Boot image. MRC stands for Memory Reference Code. It is a binary blob which U-Boot uses to set up SDRAM. Note: Without this binary U-Boot will not be able to set up its SDRAM so will not boot. config CACHE_MRC_BIN bool depends on HAVE_MRC default n help Enable caching for the memory reference code binary. This uses an MTRR (memory type range register) to turn on caching for the section of SPI flash that contains the memory reference code. This makes SDRAM init run faster. config CACHE_MRC_SIZE_KB int depends on HAVE_MRC default 512 help Sets the size of the cached area for the memory reference code. This ends at the end of SPI flash (address 0xffffffff) and is measured in KB. Typically this is set to 512, providing for 0.5MB of cached space. config DCACHE_RAM_BASE hex depends on HAVE_MRC help Sets the base of the data cache area in memory space. This is the start address of the cache-as-RAM (CAR) area and the address varies depending on the CPU. Once CAR is set up, read/write memory becomes available at this address and can be used temporarily until SDRAM is working. config DCACHE_RAM_SIZE hex depends on HAVE_MRC default 0x40000 help Sets the total size of the data cache area in memory space. This sets the size of the cache-as-RAM (CAR) area. Note that much of the CAR space is required by the MRC. The CAR space available to U-Boot is normally at the start and typically extends to 1/4 or 1/2 of the available size. config DCACHE_RAM_MRC_VAR_SIZE hex depends on HAVE_MRC help This is the amount of CAR (Cache as RAM) reserved for use by the memory reference code. This depends on the implementation of the memory reference code and must be set correctly or the board will not boot. config HAVE_REFCODE bool "Add a Reference Code binary" help Select this option to add a Reference Code binary to the resulting U-Boot image. This is an Intel binary blob that handles system initialisation, in this case the PCH and System Agent. Note: Without this binary (on platforms that need it such as broadwell) U-Boot will be missing some critical setup steps. Various peripherals may fail to work. config HAVE_MICROCODE bool default y if !FSP_VERSION2 config SMP bool "Enable Symmetric Multiprocessing" default n help Enable use of more than one CPU in U-Boot and the Operating System when loaded. Each CPU will be started up and information can be obtained using the 'cpu' command. If this option is disabled, then only one CPU will be enabled regardless of the number of CPUs available. config MAX_CPUS int "Maximum number of CPUs permitted" depends on SMP default 4 help When using multi-CPU chips it is possible for U-Boot to start up more than one CPU. The stack memory used by all of these CPUs is pre-allocated so at present U-Boot wants to know the maximum number of CPUs that may be present. Set this to at least as high as the number of CPUs in your system (it uses about 4KB of RAM for each CPU). config AP_STACK_SIZE hex depends on SMP default 0x1000 help Each additional CPU started by U-Boot requires its own stack. This option sets the stack size used by each CPU and directly affects the memory used by this initialisation process. Typically 4KB is enough space. config CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED bool help This option indicates that the turbo mode setting is not package scoped. i.e. turbo_enable() needs to be called on not just the bootstrap processor (BSP). config HAVE_VGA_BIOS bool "Add a VGA BIOS image" help Select this option if you have a VGA BIOS image that you would like to add to your ROM. config VGA_BIOS_FILE string "VGA BIOS image filename" depends on HAVE_VGA_BIOS default "vga.bin" help The filename of the VGA BIOS image in the board directory. config VGA_BIOS_ADDR hex "VGA BIOS image location" depends on HAVE_VGA_BIOS default 0xfff90000 help The location of VGA BIOS image in the SPI flash. For example, base address of 0xfff90000 indicates that the image will be put at offset 0x90000 from the beginning of a 1MB flash device. config HAVE_VBT bool "Add a Video BIOS Table (VBT) image" depends on HAVE_FSP help Select this option if you have a Video BIOS Table (VBT) image that you would like to add to your ROM. This is normally required if you are using an Intel FSP firmware that is complaint with spec 1.1 or later to initialize the integrated graphics device (IGD). Video BIOS Table, or VBT, provides platform and board specific configuration information to the driver that is not discoverable or available through other means. By other means the most used method here is to read EDID table from the attached monitor, over Display Data Channel (DDC) using two pin I2C serial interface. VBT configuration is related to display hardware and is available via the ACPI OpRegion or, on older systems, in the PCI ROM (Option ROM). config VBT_FILE string "Video BIOS Table (VBT) image filename" depends on HAVE_VBT default "vbt.bin" help The filename of the file to use as Video BIOS Table (VBT) image in the board directory. config VBT_ADDR hex "Video BIOS Table (VBT) image location" depends on HAVE_VBT default 0xfff90000 help The location of Video BIOS Table (VBT) image in the SPI flash. For example, base address of 0xfff90000 indicates that the image will be put at offset 0x90000 from the beginning of a 1MB flash device. config VIDEO_FSP bool "Enable FSP framebuffer driver support" depends on HAVE_VBT && DM_VIDEO help Turn on this option to enable a framebuffer driver when U-Boot is using Video BIOS Table (VBT) image for FSP firmware to initialize the integrated graphics device. config ROM_TABLE_ADDR hex default 0xf0000 help All x86 tables happen to like the address range from 0x0f0000 to 0x100000. We use 0xf0000 as the starting address to store those tables, including PIRQ routing table, Multi-Processor table and ACPI table. config ROM_TABLE_SIZE hex default 0x10000 config HAVE_ITSS bool "Enable ITSS" help Select this to include the driver for the Interrupt Timer Subsystem (ITSS) which is found on several Intel devices. config HAVE_P2SB bool "Enable P2SB" depends on P2SB help Select this to include the driver for the Primary to Sideband Bridge (P2SB) which is found on several Intel devices. menu "System tables" depends on !EFI && !SYS_COREBOOT config GENERATE_PIRQ_TABLE bool "Generate a PIRQ table" default n help Generate a PIRQ routing table for this board. The PIRQ routing table is generated by U-Boot in the system memory from 0xf0000 to 0xfffff at every 16-byte boundary with a PCI IRQ routing signature ("$PIR"). It specifies the interrupt router information as well how all the PCI devices' interrupt pins are wired to PIRQs. config GENERATE_SFI_TABLE bool "Generate a SFI (Simple Firmware Interface) table" help The Simple Firmware Interface (SFI) provides a lightweight method for platform firmware to pass information to the operating system via static tables in memory. Kernel SFI support is required to boot on SFI-only platforms. If you have ACPI tables then these are used instead. U-Boot writes this table in write_sfi_table() just before booting the OS. For more information, see http://simplefirmware.org config GENERATE_MP_TABLE bool "Generate an MP (Multi-Processor) table" default n help Generate an MP (Multi-Processor) table for this board. The MP table provides a way for the operating system to support for symmetric multiprocessing as well as symmetric I/O interrupt handling with the local APIC and I/O APIC. config GENERATE_ACPI_TABLE bool "Generate an ACPI (Advanced Configuration and Power Interface) table" default n select QFW if QEMU help The Advanced Configuration and Power Interface (ACPI) specification provides an open standard for device configuration and management by the operating system. It defines platform-independent interfaces for configuration and power management monitoring. endmenu config HAVE_ACPI_RESUME bool "Enable ACPI S3 resume" select ENABLE_MRC_CACHE help Select this to enable ACPI S3 resume. S3 is an ACPI-defined sleeping state where all system context is lost except system memory. U-Boot is responsible for restoring the machine state as it was before sleep. It needs restore the memory controller, without overwriting memory which is not marked as reserved. For the peripherals which lose their registers, U-Boot needs to write the original value. When everything is done, U-Boot needs to find out the wakeup vector provided by OSes and jump there. config S3_VGA_ROM_RUN bool "Re-run VGA option ROMs on S3 resume" depends on HAVE_ACPI_RESUME help Execute VGA option ROMs in U-Boot when resuming from S3. Normally this is needed when graphics console is being used in the kernel. Turning it off can reduce some resume time, but be aware that your graphics console won't work without VGA options ROMs. Set it to N if your kernel is only on a serial console. config STACK_SIZE hex depends on HAVE_ACPI_RESUME default 0x1000 help Estimated U-Boot's runtime stack size that needs to be reserved during an ACPI S3 resume. config MAX_PIRQ_LINKS int default 8 help This variable specifies the number of PIRQ interrupt links which are routable. On most older chipsets, this is 4, PIRQA through PIRQD. Some newer chipsets offer more than four links, commonly up to PIRQH. config IRQ_SLOT_COUNT int default 128 help U-Boot can support up to 254 IRQ slot info in the PIRQ routing table which in turns forms a table of exact 4KiB. The default value 128 should be enough for most boards. If this does not fit your board, change it according to your needs. config PCIE_ECAM_BASE hex default 0xe0000000 help This is the memory-mapped address of PCI configuration space, which is only available through the Enhanced Configuration Access Mechanism (ECAM) with PCI Express. It can be set up almost anywhere. Before it is set up, it is possible to access PCI configuration space through I/O access, but memory access is more convenient. Using this, PCI can be scanned and configured. This should be set to a region that does not conflict with memory assigned to PCI devices - i.e. the memory and prefetch regions, as passed to pci_set_region(). config PCIE_ECAM_SIZE hex default 0x10000000 help This is the size of memory-mapped address of PCI configuration space, which is only available through the Enhanced Configuration Access Mechanism (ECAM) with PCI Express. Each bus consumes 1 MiB memory, so a default 0x10000000 size covers all of the 256 buses which is the maximum number of PCI buses as defined by the PCI specification. config I8259_PIC bool "Enable Intel 8259 compatible interrupt controller" default y help Intel 8259 ISA compatible chipset incorporates two 8259 (master and slave) interrupt controllers. Include this to have U-Boot set up the interrupt correctly. config APIC bool "Enable Intel Advanced Programmable Interrupt Controller" default y help The (A)dvanced (P)rogrammable (I)nterrupt (C)ontroller is responsible for catching interrupts and distributing them to one or more CPU cores. In most cases there are some LAPICs (local) for each core and one I/O APIC. This conjunction is found on most modern x86 systems. config PINCTRL_ICH6 bool help Intel ICH6 compatible chipset pinctrl driver. It needs to work together with the ICH6 compatible gpio driver. config I8254_TIMER bool default y help Intel 8254 timer contains three counters which have fixed uses. Include this to have U-Boot set up the timer correctly. config SEABIOS bool "Support booting SeaBIOS" help SeaBIOS is an open source implementation of a 16-bit X86 BIOS. It can run in an emulator or natively on X86 hardware with the use of coreboot/U-Boot. By turning on this option, U-Boot prepares all the configuration tables that are necessary to boot SeaBIOS. Check http://www.seabios.org/SeaBIOS for details. config HIGH_TABLE_SIZE hex "Size of configuration tables which reside in high memory" default 0x10000 depends on SEABIOS help SeaBIOS itself resides in E seg and F seg, where U-Boot puts all configuration tables like PIRQ/MP/ACPI. To avoid conflicts, U-Boot puts a copy of configuration tables in high memory region which is reserved on the stack before relocation. The region size is determined by this option. Increse it if the default size does not fit the board's needs. This is most likely due to a large ACPI DSDT table is used. config INTEL_CAR_CQOS bool "Support Intel Cache Quality of Service" help Cache Quality of Service allows more fine-grained control of cache usage. As result, it is possible to set up a portion of L2 cache for CAR and use the remainder for actual caching. # # Each bit in QOS mask controls this many bytes. This is calculated as: # (CACHE_WAYS / CACHE_BITS_PER_MASK) * CACHE_LINE_SIZE * CACHE_SETS # config CACHE_QOS_SIZE_PER_BIT hex depends on INTEL_CAR_CQOS default 0x20000 # 128 KB config X86_OFFSET_U_BOOT hex "Offset of U-Boot in ROM image" depends on HAVE_SYS_TEXT_BASE default SYS_TEXT_BASE config X86_OFFSET_SPL hex "Offset of SPL in ROM image" depends on SPL && X86 default SPL_TEXT_BASE config ACPI_GPE bool "Support ACPI general-purpose events" help Enable a driver for ACPI GPEs to allow peripherals to send interrupts via ACPI to the OS. In U-Boot this is only used when U-Boot itself needs access to these interrupts. This can happen when it uses a peripheral that is set up to use GPEs and so cannot use the normal GPIO mechanism for polling an input. See https://queue.acm.org/blogposting.cfm?id=18977 for more info config SPL_ACPI_GPE bool "Support ACPI general-purpose events in SPL" help Enable a driver for ACPI GPEs to allow peripherals to send interrupts via ACPI to the OS. In U-Boot this is only used when U-Boot itself needs access to these interrupts. This can happen when it uses a peripheral that is set up to use GPEs and so cannot use the normal GPIO mechanism for polling an input. See https://queue.acm.org/blogposting.cfm?id=18977 for more info config TPL_ACPI_GPE bool "Support ACPI general-purpose events in TPL" help Enable a driver for ACPI GPEs to allow peripherals to send interrupts via ACPI to the OS. In U-Boot this is only used when U-Boot itself needs access to these interrupts. This can happen when it uses a peripheral that is set up to use GPEs and so cannot use the normal GPIO mechanism for polling an input. See https://queue.acm.org/blogposting.cfm?id=18977 for more info endmenu